LIGGGHTS 1.5 (released 30 November 2011)
New features:
+ Added a new (simple) model for particle breakage via command fix breakparticle/force with new example 'breakage'. Doc for the command to come in the next release
Updates to the insertion commands:
+ Re-work for fix insert/pack, see doc for details
+ New insertion command fix insert/rate/region
+ New keywords "start" for fix insert/pack, fix insert/stream and fix insert/rate/region and new keyword 'duration' fix insert/stream.
+ Improvements to fix insert/stream which makes the stream more continuous for option overlapcheck = yes
Some bug fixes:
+ Fixed a bug in rolling friction model that actually violated equilibrium by applying different torques to the two particles for poly-disperse systems - thanks to Prof. Katterfeld (University of Magdeburg) for pointing this out.
+ Fixed a memory issue with fix particledistribution/discrete and fix template/sphere if distributions were used by multiple fix insert commands or templates were used by multiple particle distributions.
+ Fixed a typo in compute pair/gran/local. Thanks to Rami Jabakhanji for tracking this down.
BACKWARD COMPATIBILITY NOTE:
+ Changed keyword 'volumefraction' to 'volumefraction_region' for fix insert/pack - check doc for details.
+ The fix for the rolling friction model will lead to different results now if the same parameters are used.